Table Of ContentIndonesian Journal of Electrical Engineering and Computer Science
Vol. 17, No. 1, January 2020, pp. 1~9
ISSN: 2502-4752, DOI: 10.11591/ijeecs.v17.i2.pp1-9 1
Performance simulation of broadband multimedia wireless
networks simulation based on OPNET
Sameer Abdul-Sattar Lafta1, Aktham Hasan Ali2, Marwah M. Kareem3,
Yasser A. Hussein4, Adnan H. Ali5
1Middle Technical University, Technical Electronics Dept., TIT Institute, Iraq
2Middle Technical University, Institute of Technology, Electronic Techniques Department, Iraq
3,4Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Malaysia
3Computer Techniques Engineering, Al-Israa College University, Iraq
5Middle Technical University, Institute of Technology-Baghdad, Iraq
Article Info ABSTRACT
Article history: As the rapid growth of multimedia application over the Internet, it is essential
to preserve the Quality of Service (QoS), which is certifying the guaranteed
Received May 13, 2019
service through the Internet and representing the biggest challenges for
Revised Jun 14, 2019 the current IP based services. Multimedia traffic usage has been increased in
Accepted Jul 28, 2019 relation to the streaming media such as video conferencing using OPNET,
the performance can be simulated based on heavy and light scenarios for
video conferencing including web traffic. The overall WLAN load data are
Keywords: obtained for such scenarios, also the performance of simulated overall Delay
in the three scenario networks is measured.
Light & heavy load
Multimedia application
OPNET
QoS
WLAN Copyright © 2020 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Adnan H. Ali,
Middle Technical University,
Electrical Engineering Technical College,
Baghdad, Iraq.
Email: [email protected].
1. INTRODUCTION
Wireless networking can now be considered as the backbone of the modern telecommunication
system. A request for fast transmitting of the high-speed data without appreciable loss had been guided to
the technology evolutions such as WLAN or WiMAX. Despite the fact that these technologies have
enhancement level that reached for confronting demand from the customers, there is still ample scope
for increasing quality of service (QoS) and data rate beyond the present level [1].
The utilizing of wireless networks may be for providing a network connectivity nearly everywhere,
such networks equipping big companies with a choice of connecting the wired networks with a modern
wireless network unaccompanied by any problems in addition to select any group of applications for users
nevertheless of suppliers or sources. The forthcoming WLAN permit users for moving to anyone
communication, everyplace at whatever time with a variety services in multimedia. Such applications
of wireless communication systems have expanded from simple voice services to integrate data services [2].
The network revolutions, that happening with a technology of broadbands, give a possibility
of a wide diversity of applications and facilities. Beyond a market relaxation, an innovative possibility
initiates modern applications and requirements. The networks with High-speed permit the conception
of original applications, that may cause multiple challenges and big problems. Currently, a commonly using
of Wireless networks, but the mobility of users, the management of networks, besides the current protocols
Journal homepage: http://ijeecs.iaescore.com
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increase important network issues, that should take into consideration the next-generation in
the telecommunication network [3, 4].
The wireless networks have multi-services that can transmit data, voices, multimedia, and video
traffics [5]. The integration of wireless access and broadband networks in their architecture in order to be
convenient for applications of mobile and multimedia with bankrupt traffic [6, 7]. In multimedia networks at
high-speed with mobile applications, new challenges have been confused by bankrupt traffic.
Actually, the applications of data, multimedia, voice and video network services shared with the challenges
in both high-speed and wireless networks need recently developed solutions for synchronization problems
in multimedia schemes, dynamic channel function in cellular mobile networks, incoming technologies,
QoS and requirements of performance associated with the services and applications proposed [8, 9].
The wireless networking approval is driven by spreading of portable mobile devices, along with an
appropriateness of release communications. With growing multimedia content deployment on the Internet
along with the deployment of time-sensitive critical applications, there is a strong motivation to develop QoS
features to meet the most stringent performance requirements [10]. The term QoS refers to the guarantees on
the ability of a network to deliver predictable results and a more deterministic performance, so data can
be transferred with a minimum delay, packet loss, jitter and maximum throughput. The QoS does not take
into account the user’s perception of the quality [11, 12].
The main Internet applications in the wireless network like file transfer or email can be considered
elastic applications, that’s mean they are not requirements limited by strict performances, and consequently
well corresponding with the delivery mode of Internet’s datagram which provides network-layer
connectionless service [13, 14]. A world of the modern Internet, that is a full capable of multimedia
applications, needs guarantees of QoS that users must arise for assuming from the world
of telecommunications network. Therefore, for supporting applications of multimedia and other collaborative
performances, a support is a needed for QoS features over QoS supplying that delivers resource confirmation
along with service distinction [15, 16].
The core topical of this work offered in this paper can be focuses in evaluating the WLAN
performance, particularly end to end delay, load, media access delay, and the received and sent traffics.
Network's multimedia traffic in a video conferencing mode is employed with various scenarios so as to
compare between them. The simulation of networks is set up by OPNET 14.5 modeler. Each scenario varies
from the others with physical layer technology and transmission rate.
2. MECHANISM OF RTS/CTS
The base station in wireless network is well prepared for transmitting and made sending a short
frame of Request To Send (RTS) before transmission of each data frame. An RTS frame impact is less
potential than impact of the real data frame owing to the size differences. When the base station
at the receiver is ready for receiving, the RTS frame is acknowledged with a send frame of Clear To Send
(CTS) for sender, hence all traffic are blocked from another station [17]. Furthermore, if the source
is received CTS frame, then a data frame is sent in case channel is reserved for a full transmission length.
Finally, the ACK frame is sent by receiver to the sender based on frame receiving [18]. Thus, a significant
efficiency evaluation of optional mechanism of RTS/CTS handshake on the performance for analyzing
the IEEE 802.11 based WLANs [19].
3. OPNET IMPLEMENTATION & SIMULATION
3.1. OPNET Modulator
OPNET Company (Optimized Network Engineering Tool) was initiated in MIT (Massachusetts
Institute of Technology), and its establishment in 1986. A year later, 1987, first simulation software
of commercial network performances was released by OPNET company which could providing an
optimization tool of important network performances that made a revolutionized network simulation [20].
Creation the management of analytical network performances is powerful with simulation and thus it
becomes possible. The development of other products at OPNET besides Modeler is done, it also comprises
a Kit of OPNET Development, WDM Guru etc [21, 22].
The model of simulation is considered a progressively popular approach for studying
the performances and functionalities of the suggested models in various scenarios. Simulation is a testing
procedure of a designed prototypical on a platform that duplicates the real environment and offers
the opportunity for studying, creating, and modifying the performance of design proposing with the purpose
of strengthens and weakness the expectation before the model implementation in a real environment [23, 24].
Indonesian J Elec Eng & Comp Sci, Vol. 17, No. 1, January 2020 : 1 - 9
Indonesian J Elec Eng & Comp Sci ISSN: 2502-4752 3
A flow chart of simulation of any system started with the steps that is taken in the simulation
process. For each scenario, the network traffic, configurations are modified and the simulation is run [25]. A
flowchart is used to illustrate the key steps taken to assess the performances of a WLAN is seen in Figure 1.
Figure 1. Flow chart to evaluate the performance of WLAN
3.2. Baseline Scenario
The Baseline 802.11g model scenario is formed utilizing a standard model's variation of the OPNET
14.5 WLAN arrangement scenario. Within such scenario, a single infrastructure 802.11g WLAN behavior
can be inspected in the organized WLAN framework for better emulating the actual network conformation as
shown in Figure 2. An Internet Protocol IP cloud van be using to signify the Internet backbone is connected
with a serial link of Point-to-Point T1 (1.544Mbps) [19]. The three subnets are positioned at each side of IP
cloud through an IP gateway connecting by Point-to-Point Protocol T1 link and two servers are connecting
via a central switch utilizing a link of 100BaseT, as seen in Figure 2, and wireless as seen in
Figure 3 respectively.
Figure 2. Simulated wire server frameworks
Performance simulation of broadband multimedia wireless networks simulation …(SamirAbdul Sattar Lafta)
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Figure 3. Simulated wireless server frameworks
The location of subnet one is at the right side of the Internet Protocol (IP) cloud and the servers
of the traffic network are connected by 100BaseT Ethernet, the servers is connecting to the firewall
by 100BaseT Ethernet link and can be using in place of sources and destinations at all applications:
video conferencing, Hypertext Transfer Protocol (HTTP), File Transfer protocol (FTP), voice applications,
Electronic Mail (E-mail) and Database simulation on the completed network characterizing the traffic which
exchanges with the 802.11g WLAN mobile nodes through simulations, as shown in Figure 4.
The subnet two denotes the office of remoting branch that comprising five workstations
in the office_LAN connecting by a link of 100BaseT. This LAN office is connecting by a central switch with
a link 100Base Ethernet wiring to compete with a real-time office situation which uses Fast Ethernet LAN
standards. The IP gateway connects the LAN to an IP cloud, this gateway is connected to the LAN office by
100BaseT Ethernet link whereas the serial link P2P T1 is connect the IP cloud and the IP gateway,
as seen in Figure 5.
Figure 4. Subnet 1 802.11g WLAN Figure 5. Subnet 2 802.11g WLAN
Finally, the subnet three located on the other side of the Internet Protocol cloud, a connection of
WLAN is done within access point AP to LAN office by a central switch utilizing Ethernet wiring to emulate
an environment of real-time office within Fast Ethernet LAN standards that has extension of a WLAN to a
zone of wiring difficulty or demanding aesthetics like a media (voice or video) room or conference, as shown
in Figure 6. The office_LAN are divided equally amongst the profiles, with each profile having one
workstation. Here the main objective is to analyses the performances of operator perceived usefulness belong
to WLAN users, An WLAN sub network with five mobile nodes are assigned to different profiles
as shown in Table 1.
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Figure 6. Subnet 3 Offices WLAN
Table 1. Assigned Profiles of Mobile Nodes in the WLAN Sub Network
MOBILE NODE USER PROFILE
Station_1 Engineer
Station_2 Researcher
Station_3 E-commerce Customer
Station_4 Sales Person
3.3. Multimedia Load Scenarios
The multimedia traffic can be represented as a video conferencing form in the network. This form of
conferencing involves images, data, and voice, and definitive multimedia traffic representation.
While the video server is presented for assisting the application of video conferencing towards the details
of network, Figure 7 shows the configuration for multimedia employer profile applications at the scenarios of
multimedia load.
Figure 7. Application Configurations for Multimedia User Profile
4. SIMULATION RESULTS AND DISCUSSIONS
4.1. Load
A load is the first parameter which effects the total performance of the wireless efficiency.
The assessment of the load is concerned with the reception of the transmitted data in spite of don't consider
the network overhead opposed to the load. A total WLAN load with respect to the time function
as the advanced simulation can be considered as a greater extent significant results, Data have overall WLAN
load with an approximate average value of scenario heavy is (430.7407) Kbps on the 5 minute mark and
the average value of scenario light WLAN is (3622787) Kbps on the 5 minute mark and Figure 8 shows
the results belong to the first scenario. A simulation scenario (heavy) was built and run in order to obtain
the desired results for individual load as shown in Figure 9.
Performance simulation of broadband multimedia wireless networks simulation …(SamirAbdul Sattar Lafta)
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Figure 8. Total Loads on the Simulated Wireless LAN
Figure 9. Individual load values
A simulation scenario (Light) was built and run in order to obtain the results for Individual Load
Values for a subnet, as shown in Figure 10. In order to obtain the desired results of the load and the access
point are illustrated approximate average peak values stations to achieve the objective, A simulation scenario
(heavy) with a simulation scenario (Light) can be represented in Table 2.
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Figure 10. Individual load values for scenario (light) subnet one, subnet three
Table 2 The Individual load values scenario 1(light) and scenario 2(heavy)
Type Of Node WLAN Load WLAN Load (Heavy) WLAN Load WLAN Load (Light) (Kbps)
(Heavy) (Kbps) (Kbps) subnet three (Light) (Kbps) subnet three
subnet one subnet one
Access point (AP2) 42.07 (AP1) 200.2 (AP1) 916124 (AP3) 899128
E-commerce 0 188.4 73 146
costumer
Engineer 0 0 223 232
Researcher 0 0 202 260
Video 0 0 893783 87652
conferencing
Voice 0 0 17878 18201
Sub Value 42.07 388.6 1828285 1794502
Sum total 430.7407407 3622787.467
4.2. Delay
Delay can consider fundamental metric for describing any network's QoS, specifically a real time.
In application of multimedia, delay may perform a central parameter for choosing the MAC layer effective
operation, its operation time, and the mechanism of Required To Send/ Clear To Send (RTS/CTS). Delay has
two main kinds, they are a medium access delay and overall packet transmission delay statistics,
Figure 11 shows a results of average overall WLAN delay peaks at 0.0125s, these values are distinctive of an
efficient WLAN under normal traffic loads, while the average (in the Video conferencing packet End-to-End
Delay (sec)) delay peaks at (0.055s) as seen in Figure 12.
It can be seen that an WLAN Delay which characterizes the end to end delay of all the packets
received by the wireless LAN MACs by all nodes of WLAN network then higher layer forwarded. This delay
comprises medium access delay at the source MAC, reception of all the fragments individually.
An indication that WLAN Delay can be considered very high throughout those resends. The average (in the
Performance simulation of broadband multimedia wireless networks simulation …(SamirAbdul Sattar Lafta)
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Voice packet End-to-End Delay (sec)) delay peaks at (0.093s) as shown in Figure 13. A simulation different
WLAN Delay of applications are used and simulation scenario 1 (Light) Wire Server (0.0103(sec))
vs Wireless Server (0.0125(sec)) as shown in Figure 14. The delay and the access point are illustrated
approximate average peak values as shown in Table 3.
Figure 11. Simulated overall delay Figure 12. Simulated video conferencing wire
Figure 13. Simulated voice wire server delay vs Figure 14. Simulated WLAN delay (sec)
wireless server delay wireless servers vs wire server
Table 3. Wireless LAN delay (sec) Server of applications in WLAN
Wireless server Delay Wire server Delay
Application
(sec) (sec)
Video
0.039 0.055
conferencing
Voice 0.082 0.093
5. CONCLUSION
The performances of Quality of Service QoS can apply in IP networks for employment of available
network resources at greatest efficient method for minimizing delays in network traffic that have multiple
forms of multimedia services which contains voice, video and database. Two network scenarios have been
created, namely 1 heavy network, Scenario 2 (Medium Load) network and Scenario 3 (High Load) network.
The Comparison was carried out between them. Performance assessments directed were both Loads and
Delays Performances, in these Performance tests, we observed the results in two cases: heavy and light
scenarios.
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